Many thanks for your patience, I am pleased to be able to continue assisting with your query now. First of all, I am sorry to hear about the issues you have experienced in your situation.
As the scaffold is not on the scaffolders’ or subcontractor’s property, the owner can eventually take it down (or instruct someone to do so). However, as the scaffolding itself belongs to someone else, you need to ensure that when it is taken down, it is done with reasonable care and skill and it is then stored, ready for collection by its rightful owner.
Before you take it down, you need to give them formal notice of your intentions, together with a deadline to remove it themselves and then state what would happen in the event they refuse to comply. A reasonable notice would be a couple of weeks or so, to allow them to make arrangements for its removal and ensure they find a suitable date and time to do so.
However, if they fail to remove it, then you can do as discussed above.